From 73eaccf60aaeeaeee7da5937942e3677e5a553c0 Mon Sep 17 00:00:00 2001
From: Petr Skoda <commits@skodak.org>
Date: Sun, 22 Jan 2012 14:54:43 +0100
Subject: [PATCH] MDL-31081 limit query to one course in
 forum_get_subscribed_forums()

This improves performance on the forum index page. Credit goes to Mark Nielsen.
---
 mod/forum/lib.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index b32e281eca7..0fde3622718 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -4543,9 +4543,10 @@ function forum_get_subscribed_forums($course) {
     $sql = "SELECT f.id
               FROM {forum} f
                    LEFT JOIN {forum_subscriptions} fs ON (fs.forum = f.id AND fs.userid = ?)
-             WHERE f.forcesubscribe <> ".FORUM_DISALLOWSUBSCRIBE."
+             WHERE f.course = ?
+                   AND f.forcesubscribe <> ".FORUM_DISALLOWSUBSCRIBE."
                    AND (f.forcesubscribe = ".FORUM_FORCESUBSCRIBE." OR fs.id IS NOT NULL)";
-    if ($subscribed = $DB->get_records_sql($sql, array($USER->id))) {
+    if ($subscribed = $DB->get_records_sql($sql, array($USER->id, $course->id))) {
         foreach ($subscribed as $s) {
             $subscribed[$s->id] = $s->id;
         }